The Non-Skid Roof Pad is designed to keep your car top carrier from shifting on the roof of your vehicle. It also protects your vehicle’s roof from damage caused by sharp-edged objects inside the carrier. Measuring in at 36” L x 36” W, the pad is sized for use with all Rightline Gear Car Top Carriers and Car Top Duffle Bags. Instructions are provided to cut the pad to size for use with the smaller carriers. The Non-Skid Roof Pad is especially recommended when using car top carriers on vehicles WITHOUT a roof rack.